Bael 1964 (#4881)

* Added initial code for BAEL-1964, in-memory authentication application

* Switched to default security encoder instead of a specific one

spring-5-security/src/test/java/com/baeldung/inmemory/InMemoryAuthControllerTest.java

@@ -0,0 +1,48 @@
+package com.baeldung.inmemory;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = InMemoryAuthApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT)
+public class InMemoryAuthControllerTest {
+
+    @Autowired
+    private TestRestTemplate template;
+
+    @Test
+    public void givenRequestOnPublicService_shouldSucceedWith200() throws Exception {
+        ResponseEntity<String> result = template.getForEntity("/public/hello", String.class);
+        assertEquals(HttpStatus.OK, result.getStatusCode());
+    }
+
+    @Test
+    public void givenRequestOnPrivateService_shouldFailWith401() throws Exception {
+        ResponseEntity<String> result = template.getForEntity("/private/hello", String.class);
+        assertEquals(HttpStatus.UNAUTHORIZED, result.getStatusCode());
+    }
+
+    @Test
+    public void givenAuthRequestOnPrivateService_shouldSucceedWith200() throws Exception {
+        ResponseEntity<String> result = template.withBasicAuth("spring", "secret")
+            .getForEntity("/private/hello", String.class);
+        assertEquals(HttpStatus.OK, result.getStatusCode());
+    }
+    
+    @Test
+    public void givenInvalidAuthRequestOnPrivateService_shouldSucceedWith200() throws Exception {
+        ResponseEntity<String> result = template.withBasicAuth("spring", "wrong")
+            .getForEntity("/private/hello", String.class);
+        assertEquals(HttpStatus.UNAUTHORIZED, result.getStatusCode());
+    }
+
+}